POST UTME ABU 2022 Chemistry | Objective

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Question 1 View Details
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate cons\tant at 298 K is 1.5 × 10^\( -3 \) s^\( -1 \).
A. 1.8 × 10^\( -3 \) s^\( -1 \)
Correct B. 2.1 × 10^\( -3 \) s^\( -1 \)
C. 1.2 × 10^\( -3 \) s^\( -1 \)
D. 2.5 × 10^\( -3 \) s^\( -1 \)

Correct Answer: B

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Question 2 View Details
A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M NaOH is required to neutralize 20.0 mL of HCl, what is the concentration of HCl?
A. 0.05 M
Correct B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: B

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Question 3 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
Correct A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol

Correct Answer: A

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Question 4 View Details
A diagram of a plant cell is shown below. Identify the part labeled A.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 5 View Details
The half-life of a radioactive subs\tance is 5.0 years. If the initial activity is 1000 Bq, what is the activity after 10.0 years?
A. 100 Bq
Correct B. 500 Bq
C. 1000 Bq
D. 2000 Bq

Correct Answer: B

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Question 6 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 7 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 8 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 9 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 10 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 11 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 12 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 13 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
Correct D. -1793.5 kJ/mol

Correct Answer: D

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Question 14 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 15 View Details
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 16 View Details
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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Question 17 View Details
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 18 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of O2(g) if the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
Correct D. 0 kJ/mol

Correct Answer: D

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Question 19 View Details
The reaction of sulfur with oxygen to form sulfur dioxide is an example of a redox reaction. What is the oxidation state of sulfur in the reac\tant and product?
A. S: +4, SO2: +4
Correct B. S: 0, SO2: +4
C. S: +4, SO2: 0
D. S: 0, SO2: 0

Correct Answer: B

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Question 20 View Details
A 2.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). What is the pH of the solution after the reaction is complete?
A. pH 7
B. pH 10
Correct C. pH 12
D. pH 14

Correct Answer: C

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Question 21 View Details
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
Correct A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.2 M

Correct Answer: A

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Question 22 View Details
A solution of 0.1 M sodium carbonate (Na2CO3) is mixed with a solution of 0.1 M hydrochloric acid (HCl). What is the pH of the solution after the reaction is complete?
A. pH 7
B. pH 8
Correct C. pH 9
D. pH 10

Correct Answer: C

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Question 23 View Details
A 2.5 M solution of ammonia (NH3) is titrated with a 0.5 M solution of hydrochloric acid (HCl). What is the pH of the solution after the reaction is complete?
A. pH 7
B. pH 9
Correct C. pH 11
D. pH 13

Correct Answer: C

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Question 24 View Details
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 25 View Details
Calculate the molar mass of a compound with the empirical formula C2H4O2.
A. 60 g/mol
B. 90 g/mol
Correct C. 120 g/mol
D. 180 g/mol

Correct Answer: C

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